Pretimed Swing Gears have the two intermediate shaft assemblies and motor pinion assembled in a fixture which duplicates the actual vertical swing shaft gear case. The necessary rotational corrections are made until the proper motor pinion position is obtained. The components are then match-marked for simplified field assembly.
This process eliminates the need for trial and error assembly in the field. Because of the split drive characteristic of the swing gearcase, the vertical position of the single helical intermediate gears in relation to the double helical motor pinion is critical. If the gears are not properly positioned, the motor pinion may not be able to operate as designed, and the expected component life may not be achieved.